Bump markdownlint-cli2 from 0.14.0 to 0.20.0 in /docs

Bumps [markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2) from 0.14.0 to 0.20.0.
- [Changelog](https://github.com/DavidAnson/markdownlint-cli2/blob/main/CHANGELOG.md)
- [Commits](DavidAnson/markdownlint-cli2@v0.14.0...v0.20.0)

---
updated-dependencies:
- dependency-name: markdownlint-cli2
  dependency-version: 0.20.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docs/package.json

@@ -46,7 +46,7 @@
     "autoprefixer": "^10.4.19",
     "eslint": "^9",
     "eslint-config-next": "16.1.1",
-    "markdownlint-cli2": "^0.14.0",
+    "markdownlint-cli2": "^0.20.0",
     "markdownlint-rule-relative-links": "^4.0.1",
     "postcss": "^8.5.3",
     "prettier": "^3.1.0",